KR20140008969A - The construction heavy for support ring plate structure welding device - Google Patents

Abstract

The present invention relates to an automatic welding device of a support ring plate for construction heavy equipment. A plate basic member and a support ring basic member are mounted on a rotary plate in the upper part of a rotary table with a fixing clamp. While the rotary plate is rotated due to movements of a driving unit, an automatic welding device including a torch transfer unit transferring a position of a torch performing welding is welding-operated along a weld seam of the basic material. The automatic welding device controls the position of the torch transfer unit and a rotatory speed of the rotary plate by using a controller.

Description

The construction heavy for support ring plate structure welding device}

The present invention relates to a support ring plate automatic welding device for construction heavy equipment, and more particularly, the controller from a current measuring unit for measuring a predetermined reference value and the amount of current flowing on a wire for supplying power to a torch for welding. By inducing the torch to quickly track the weld seam of the base material at a suitable interval in preparation for the received measurement value, the welding quality is improved compared to the conventional welding apparatus, and the current measuring unit has a high frequency and The present invention relates to a support ring plate automatic welding device for heavy construction equipment, which is capable of improving the quality of welding by having excellent reliability of the measured value of the current measuring unit without being affected by an arc.

In general, in the case of heavy construction equipment such as excavators, by providing a turning body above the wheel body running on the track, and allowing the driven body such as the driver's seat connected to the turning body to rotate, the driver's seat of the excavator is left and right It is to be able to play a role of turning movement.

Here, a component called a support ring plate is essentially provided among the components constituting the structure of the swing structure, and the support ring plate is used to support the swing structure when rotating the driven body such as an excavator driver's seat, which is one of construction heavy equipment. will be.

That is, the support ring plate has a structure in which the support ring is welded and fixed to the center of the plate while covering the upper side of the wheel body of the endless track.

As such, it is common to have a structure in which a pivoting drive unit including a ring gear or the like is coupled to the support ring plate, and the pivoting drive unit and the driver's seat of the excavator are connected to pivot the driven body.

At this time, the welding method of the plate and the support ring mainly uses arc welding in which the molten portion is added to the welding rod while melting the joined portion of the metal by electric heat.

The arc welding generates an arc between the welding rod and the welding part and supplies carbon dioxide gas from the nozzle of the torch to cut off the arc and molten metal from the atmosphere so that the welding is performed in a stable state. In recent years, it is widely spread.

In recent years, an automatic welding machine for automatic arc welding has been developed, and even when a skilled welder is lacking in recent years, the introduction of the automatic welding machine does not require a professional welder, thereby reducing the city park cost and reducing air by automation of welding. .

In addition, the base plate and the support ring is welded, and the base material is mounted on a rotating table so that the welding work is performed by the automatic welding machine while the base material is rotated to automate the welding work.

In addition, the automatic welding machine is provided with a torch for supplying CO gas and a welding rod and generating an arc at a position adjacent to the welding portion to perform a welding operation, and conveying means for transferring the torch along a welding direction at a constant speed. It is configured to weld along the base welding seam during rotation of the rotating table equipped with the base material.

Therefore, the automatic welding machine is attached by a welding rod which is melted and melted at the same time as the welding part is melted in a stable state by the arc generated at the tip of the torch when the torch is close to the welding core and the work is performed. The torch is transferred at a constant speed to complete the welding in the longitudinal direction.

However, in the conventional automatic welding device, the plate and the support ring mounted on the rotating table are high weights, and are mounted in a horizontal state on the rotating table, thereby requiring a wide working space. In order to prevent a lot of clamps, the operator had to lock and unlock them all.

In addition, the conventional automatic welding apparatus is not only to be manufactured according to the shape or size of the welding base material to be welded, but also required a separate sensor mechanically to adjust the gap between the torch and the weld seam.

The degree of clearance between the torch and the weld seam has a significant effect on the welding state, and if the gap is not smoothly adjusted during the welding process, this may cause welding failure.

Such a mechanical sensor used in a conventional automatic welding device is a proximity sensor is usually used to provide a measurement of the distance between the torch and the welding seam in advance, the torch is transferred based on the measured value and welded at the appropriate position with the welding seam To drive

In this case, it is preferable that the proximity sensor is positioned close to the torch for precise position control of the torch, but it is difficult to install the proximity sensor in close proximity to the torch at which high temperature welding is performed. Somewhat lower, there was a problem that the quality of the weld is somewhat lower.

Furthermore, due to the high frequency, the arc of interference caused by the arc of welding, the high value, poor ambient conditions such as high temperature, dust due to the welding gas due to the frequent failure and error of the proximity sensor in the proximity sensor The low reliability of the measured value to transmit the measurement not only caused the welding defect of the product, but also had the inconvenience of having to inspect the welding site on the job site.

The present invention has been proposed in order to solve the above-mentioned problems, the object of which is that the controller from the current measuring unit for measuring the preset reference value and the amount of current flowing on the wire for supplying power to the torch to perform welding By inducing the torch to quickly track the weld seam of the base material at a suitable interval in preparation for the received measurement value, the welding quality is improved compared to the conventional welding apparatus, and the current measuring unit has a high frequency and The present invention provides a support ring plate automatic welding device for heavy construction equipment, which is capable of improving the welding quality by providing excellent reliability of the measured value of the current measuring unit without being affected by an arc.

Furthermore, since the current measuring unit is not exposed to dust caused by high temperature and welding gas generated during welding, support ring plate automatic welding device for heavy construction equipment which can reduce the occurrence of welding failure by minimizing the occurrence of failure and error caused by high temperature and dust. In providing.

In addition, the rotary plate of the rotary table is tilted to move, simultaneously welding the inner and outer welding cores of the base material using an automatic welding machine while the base plate of the plate and the support ring mounted on the rotating plate is inclined, thereby working with convenience of work. It is to provide a support ring plate automatic welding device for heavy construction equipment to improve efficiency.

In addition, by using a hydraulic fixing clamp as a means for fixing the base material mounted on the rotary table, providing a support ring plate automatic welding device for construction heavy equipment that can be fixed simply and firmly with only a small number of fixed clamps than conventional Is in.

Support ring plate automatic welding device for construction heavy equipment according to the present invention for achieving the above object is the plate base material and the support ring base material is mounted to the rotating plate on the rotary table by using a fixed clamp, the rotating plate by the operation of the drive means An auto welder having a torch conveying means for conveying the position of the torch for welding while rotating, welds along the weld seam of the base material, and uses a controller to control the rotational speed of the rotating plate and the position of the torch conveying means. In the plate automatic welding device,

The rotary table, the rotating shaft is formed at both ends of the housing including a drive means and the rotating plate, the housing is rotatably coupled to the upper end of the table frame,

A fixing plate is formed at the front end of the housing and at the rear lower end of the table frame, and pins are coupled at both ends of the cylinder member to the fixing plate to adjust the angle of rotation table about the rotating shaft as the cylinder rod is drawn out. .

In addition, the fixed clamp is a lower plate installed on the rotating plate of the rotary table, the upper body and the lower end of the lower body and the side plate formed with a guide rail formed on the outside having an inner space coupled to both sides; and in the inner space of the support body Double-acting hydraulic cylinder is fixedly installed, the cylinder rod is provided at both ends to slide the cylinder rod before and after the slide according to the hydraulic supply; and is fastened and fixed to the upper end of the support body, the base material bottom surface is supported And a support portion fitted to the guide rails formed at the inside and the outside of the side plate of the support body are formed at upper and lower ends thereof, and the inner surface portion is connected and assembled with the cylinder rod, and the support body is pulled out by drawing out the cylinder rod of the double-acting hydraulic cylinder. A movable member for sliding the inner space of the front and rear slides; and an inner end fixed to the upper portion of the movable member and toward the center of the rotating plate. A pressing surface is inclined downward in the molding formed, the pressing member for pressing the top surface of the base material is placed on the push side base plate in accordance with the inner movement of the moving member; characterized by consisting of a.

The apparatus may further include a current measuring unit electrically connected to the torch to measure a current amount flowing through the wire and installed on the wire to provide power to the torch to perform welding, and to transmit the measured value to the controller. Composed by

The controller may be configured to control the torch transfer unit 220 to suitably control the position of the torch by comparing the initial reference value and the measured value measured and transmitted by the current measuring unit.

In addition, a hall sensor is used as the current measuring unit.

As described above, according to the support ring plate automatic welding device for construction equipment according to the present invention, the controller from the current measuring unit for measuring the preset reference value and the amount of current flowing on the wire for supplying power to the torch for welding. By inducing the torch to quickly track the weld seam of the base material at a suitable interval in preparation for the received measurement value, the welding quality is improved compared to the conventional welding apparatus, and the current measuring unit has a high frequency and Since the reliability of the measured value of the current measuring unit is not affected by the interference of the arc, there is an effect that the quality of the welding can be further improved.

Furthermore, since the current measuring unit is not exposed to dust caused by high temperature and welding gas generated during welding, there is an effect of minimizing failure and error caused by high temperature and dust to reduce the occurrence of welding failure.

In addition, the rotary plate of the rotary table is tilted to move, simultaneously welding the inner and outer welding cores of the base material using an automatic welding machine while the base plate of the plate and the support ring mounted on the rotating plate is inclined, thereby working with convenience of work. There is an effect to improve the efficiency.

In addition, by using a hydraulic fixing clamp as a means for fixing the base material mounted on the rotary table, there is an effect that can be fixed simply and firmly with only a small number of fixed clamps than conventional.

1 is a front perspective view of a support ring plate automatic welding device for construction heavy equipment according to an embodiment of the present invention
2 is a rear perspective view of the support ring plate automatic welding device for construction heavy equipment shown in FIG.
Figure 3 is a front view showing the tilting operation of the rotary table of the support ring plate automatic welding device for construction heavy equipment shown in FIG.
4 is a partially enlarged cross-sectional view of a rotary table of the support ring plate automatic welding device for construction heavy equipment shown in FIG.
5 is a perspective view of a fixing clamp of the support ring plate automatic welding device for construction heavy equipment shown in FIG.
Figure 6 is a front view showing the operation of the fixing clamp of the support ring plate automatic welding device for construction heavy equipment shown in FIG.

On the basis of the accompanying drawings, the support ring plate automatic welding device for construction heavy equipment according to a preferred embodiment of the present invention will be described in detail.

1 to 6 show a support ring plate automatic welding device for construction heavy equipment according to an embodiment of the present invention, Figure 1 is a front perspective view of the support ring plate automatic welding device for construction heavy equipment according to an embodiment of the present invention 2 is a rear perspective view of the support ring plate automatic welding device for construction heavy equipment shown in Figure 1, Figure 3 is a front view showing the tilting operation of the rotary table of the support ring plate automatic welding device for construction heavy equipment shown in FIG. 4 is a partially enlarged cross-sectional view of a rotating table of the support ring plate automatic welding device for construction heavy equipment shown in FIG. 1, and FIG. 5 is a perspective view of a fixing clamp of the support ring plate automatic welding device for the construction heavy equipment shown in FIG. 6 is a front view showing the operation of the fixing clamp of the support ring plate automatic welding device for construction heavy equipment shown in FIG. will be.

The inventors of the swing construction plate automatic welding device (A) for construction heavy equipment using an automatic welding machine while tilting the rotary table equipped with an excavator lower plate (plate) and a support ring (support ring) base material to rotate the base material (Tilting) Automatic welding can be done inside and outside of the base material at the same time.

As shown in the drawings, the present invention is to weld the lower plate base material (1) and the support ring base material (2) for heavy chain heavy material, the base material (1, 2) mounted on the rotary table 100 Rotating, so that the automatic welding machine 200 is arc welding at the same time while tracking the inner and outer welding core of the base material (1, 2) is rotated.

To this end, the automatic welding machine 200 is typically provided with a torch transfer means 220 for transferring the position of the torch 10 to perform welding on the upper end of the holding frame, the torch transfer means 220 is a torch And a horizontal conveying unit 221 for controlling the horizontal conveyance of 10 and a vertical conveying unit 222 for controlling the vertical conveying of the torch 10.

Therefore, the position of the torch 10 is determined through the operation of the horizontal and vertical conveying units 221 and 222 of the torch conveying means 220, and the torch conveying means 220 controls the controller to be settled later. It works through

Here, the automatic welding machine 200 is provided with a plurality of torch 10 so as to perform welding at the same time, the inside and outside of the base material (1, 2) mounted on the rotary table 100, wherein The torch transfer means 220 for transferring the position of the torch 10 is of course installed corresponding to the number of the torch 10.

At this time, in order to ensure the welding convenience of the base material (1, 2) mounted on the rotary table 100, as shown in Figures 1 to 3, the rotary table 100 is a base material (1, 2) housing Tilt the housing 110 in a state in which it is mounted on the rotating plate 111 of the upper part to be inclined to secure the inclination of the base materials 1 and 2, and thus, through the auto welder 200, the base materials 1 and 2. It is preferable to facilitate the welding of the inside and outside of the.

Such a configuration of the rotary table 100 has a rotating shaft 113 formed at both ends of the housing 110 including the driving means 112 and the rotating plate 111, and the housing at the upper end of the table frame 120. 110 is rotatably axially coupled.

In addition, fixing plates 114 and 121 are formed at one front end of the housing 110 and the rear lower end of the table frame 120, and pins both ends of the cylinder member 130 are fixed to the fixing plates 114 and 121 to form a cylinder rod 131. In accordance with the withdrawal of the) the rotation table 100 around the rotating shaft 113 to adjust the angle.

In addition, the table frame 120 is ground so that the base material (1, 2), which is a weight body, is mounted on the rotary table 100 to rotate, or has a height such that the rotary table 100 can be sufficiently rotated in an inclined state. In the fixed height is formed at a certain height, one side is provided with a hydraulic supply.

As such, the upper end of the table frame 120, the rotary shaft 113 formed on both sides of the rotary table 100 is rotatably assembled, even when the rotary table 100 is in a horizontal state or inclined state. ) Can be firmly supported.

At this time, it is preferable to detect the rotation angle of the rotary table 100 by mounting an inclination detection sensor to one side of the table frame 120 assembled with the rotary shaft 113.

In addition, as a means for tilting the rotary table 100, one end of the cylinder member 130 is coupled to the rear lower fixing plate 121 of the table frame 120, the other end, that is, the cylinder rod 131 is a rotary table Coupled to the front fixing plate 114 of the (100), respectively, the rotary table 100 around the rotating shaft 113 in accordance with the withdrawal of the cylinder rod 131 to enable a tilting movement.

Therefore, the operator can arbitrarily adjust the tilting angle of the rotary table 100 through the controller 300 according to the size and shape of the base material (1, 2), and automatically to the base material (1,2) inclined at a desired angle Welder 200 will be able to perform a welding operation.

Here, the controller 300 is not represented on the drawing, but is selected and installed so as to receive a signal by wire or wireless from any one of the body of the automatic welding machine 200, the rotary table 100, the table frame 120, It is to control the operation of each component.

In addition, as shown in FIGS. 5 and 6, the hydraulic fixing clamps 150 for fixing the base materials 1 and 2 placed on the rotating plate 111 are equally spaced at the upper portion of the rotating plate 111. , Using a hydraulic cylinder 170 to firmly fix the high weight of the base material.

That is, the fixed clamp 150 is largely fastened to the support body 160 configured to have an inner space on the rotating plate 111 of the rotary table 100, in a state where the double-acting hydraulic cylinder 170 is fixed to the inner space. According to the withdrawal of the cylinder rod 171, the moving member 180 coupled with the pressing member 190 is transferred before and after to fix the base material 10 and 20.

The supporting body 160 is an upper space of the lower plate 161 installed on the rotating plate 111 of the rotary table 100, and the side plate 162 having the guide rails 163 formed inside and outside the upper and lower ends thereof has an inner space. The lower plate 161 is vertically erected on both sides to have a combined configuration.

In addition, the double-acting hydraulic cylinder 170 having the cylinder rod 171 at both ends is fixedly installed in the inner space of the support body 160 so that the cylinder rod 171 slides forward and backward according to the hydraulic pressure supply. To be.

In addition, the upper end of the support body 160 is fastened and fixed to the support plate 165, while the bottom surface of the base material 10, 20 is placed to support it, while having a fitting pin fitted to the fixing hole of the base material on one side. The flow of the mother metal can be prevented.

In addition, the moving member 180 is located in the interior space of the support body 160, the fitting portion 181 formed on the upper and lower ends of the body, the guide rail 163 formed on the inside and the outside of the side plate 162 The inner surface portion is coupled and assembled with the cylinder rod 171, and slides the inside space of the support body 160 before and after the cylinder rod 171 of the double-acting hydraulic cylinder 170 withdrawal.

In addition, the pressing member 190 is coupled to the upper portion of the movable member 180 to move forward and backward like the movable member 180, and the pressing member 190 has an inner end portion toward the center of the rotating plate. The pressing surface 191 is formed to be inclined downward, the pressing surface 191 is configured to press the upper surface of the base material 10, 20 placed on the support plate 165 according to the inner movement of the moving member 180. .

Accordingly, by installing the hydraulic fixed clamp 150 configured as described above to the rotary plate 111 of the rotary table 100, the base material of the heavy weight by the operation of the double-acting hydraulic cylinder 170 according to the signal of the controller 300 ( 1,2) can be installed firmly.

As described above, in the state in which the base materials 1 and 2 are mounted on the rotary table 100 and tilted, the automatic welding machine 200 has a torch transfer means 220 having a welding rod at the inner and outer joint portions of the base materials 10 and 20. It operates to be located.

Then, when electricity is supplied through the controller 300, the welding portion of the welding rod and the metal is melted by electrical heat, and the molten portion is added to the welding rod.

Here, the amount of current flowing through the wire 4 is installed on the wire 4 that is electrically connected to the torch 10 and provides power to the torch 10 for welding. By further comprising a; current measuring unit for transmitting to the controller 300;

The controller 300 controls the torch transfer means 220 by comparing a reference value initially set and a measured value measured and transmitted by the current measuring unit 400 to control the torch transfer unit 220. To control appropriately.

At this time, the initial reference value is calculated in consideration of the material, size, etc. of the base material (1, 2) can be input to the controller 300 in advance, of course, the operator arbitrarily directly to the controller 300 You can also type.

Here, a hall sensor is used as the current measuring unit 400, but is not limited thereto.

When the welding operation is described in detail, it is difficult for the support ring base material 2 to be made into a perfect garden, and furthermore, since the support ring base material 2 is somewhat difficult to settle in the center of the rotary table 100,

In the welding process, the gap between the torch 10 and the support ring base material 2 that is rotated is continuously changed. When the gap is narrowed, the amount of power required of the torch 10 due to excessive arcing increases and the current is increased. When the measured value of the measuring unit 400 rises and the gap is widened, the arc generation is small, so that the required power amount of the torch 10 decreases, so that the measured value of the current measuring unit 400 falls,

As shown in Table 1 below, since the error between the reference value and the measured value is generated, the controller 300 operates the torch transfer means 220 to compensate for the error, thereby adjusting the position of the torch 10. By adjusting, the gap between the torch 10 and the welding surface is kept constant so that stable arc welding can be performed.

[Table 1]

That is, the controller 300 receives a measurement received from the current measuring unit 400 measuring a preset reference value and the amount of current flowing on the wire 4 for supplying power to the torch 10 for welding. In contrast to the value, the torch 10 controls the operation of the torch transfer means 220 to quickly track the weld seam of the base material (1, 2) at a suitable interval, so that the quality of welding can be improved It has an inducing effect.

In addition, the current measuring unit 400 is excellent in the reliability of the measured value of the current measuring unit 400 because the installation structure is not subjected to the interference of the high frequency and arc generated during welding so that the quality of the welding can be further improved. There is an advantage.

In addition, since the current measuring unit 400 is not exposed to dust caused by high temperature and welding gas generated during welding, there is an effect of minimizing failure and error caused by high temperature and dust, thereby reducing welding defects.

Controller 300 of the support ring plate automatic welding device (A) for construction heavy equipment of the present invention consisting of the above components is a reference value that is set in advance, the electric wire (4) for supplying power to the torch 10 to perform welding In contrast to the measurement value received from the current measuring unit 400 for measuring the amount of current flowing on the torch 10 by inducing the torch to quickly track the weld seam of the base material (1, 2) at a suitable interval, conventional welding In addition to the improved welding quality compared to the device, the current measuring unit 400 is excellent in the reliability of the measured value of the current measuring unit 400 is not subjected to the interference of the high frequency and arc generated during welding due to the installation structure. There is an effect to further improve the quality of the welding.

In addition, the rotary plate 111 of the rotary table 100 is tilted to move, using the automatic welding machine 200 in a state in which the base plate (1, 2) of the plate and the support ring mounted on the rotary plate 111 is inclined. By simultaneously welding the inner and outer welding cores of the base materials 1 and 2, there is an effect of improving work efficiency with convenience of work.

In addition, by using the fixing clamp 150 as a means for fixing the base material (1, 2) mounted on the rotary table 100, the base material (1, 2) simply and firmly with only a small number of fixing clamps than before ) Can be fixed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. You will understand the point. It goes without saying that variations can be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the scope of claim of the present invention is not limited within the scope of the detailed description, but will be defined by the following claims and technical ideas thereof.

1. Plate base material 2. Support ring base material
4. Wires
100. Rotary table 110. Housing
111.Rotating Plate 113.Rotary Shaft
120. Table frame 130. Cylinder member
150. Fixed clamp 160. Support body
170. Hydraulic cylinder 180. Moving member
190. Pressurizing element 200. Automatic welding machine
220. Torch transfer means 221. Horizontal transfer unit
222. Vertical Transfer Unit 300. Controller
400. Current measuring unit
A. Support ring plate automatic welding device for construction heavy equipment

Claims (4)

The plate base material 1 and the support ring base material 2 are mounted to the rotating plate 111 on the upper side of the rotating table 100 using the fixing clamp 150, and the rotating plate 111 rotates by the operation of the driving means 112. While welding, the automatic welding machine 200 having the torch conveying means 220 for conveying the position of the torch 10 to perform welding runs along the weld seam of the base materials 1 and 2, and uses the controller 300. In the support ring plate automatic welding device for controlling the rotational speed of the rotating plate 111 and the position of the torch transfer means 220,
The rotary table 100, the rotating shaft 113 is formed at both ends of the housing 110 including the drive means 112 and the rotating plate 111, the housing 110 is formed at the upper end of the table frame 120 Rotatably axially coupled,
Fixing plates 114 and 121 are formed at the front end of the housing 110 and the rear lower end of the table frame 120, and pins both ends of the cylinder member 130 are fixed to the fixing plates 114 and 121 of the cylinder rod 131. Support ring plate automatic welding device for construction heavy equipment, characterized in that the angle of rotation table 100 is adjusted around the rotation shaft 113 according to the withdrawal.
The method of claim 1,
The fixing clamp 150,
An upper body of the lower plate 161 installed on the rotating plate 111 of the rotary table 100, the side plate 162 having the guide rails 163 formed on the inner and outer sides of the upper and lower ends has an inner space and is coupled to both sides. 160);
Double-acting hydraulic cylinder 170 is fixedly installed in the interior space of the support body 160, the cylinder rod 171 is provided at both ends so that the cylinder rod 171 slides back and forth in accordance with the hydraulic supply; ,
The support plate is fastened and fixed to the upper end of the support body 160, the base plate (165) for supporting the bottom surface of the base material (1) (20);
The fitting portion 181 to be fitted to the guide rail 163 formed on the outside, the side plate 162 of the support body 160 is formed on the upper and lower ends, the inner surface is connected and assembled with the cylinder rod 171, Moving member 180 for sliding the front and rear of the inner space of the support body 160 in accordance with the withdrawal of the cylinder rod 171 of the double-acting hydraulic cylinder 170; And,
The pressing surface 191 is fixed to the upper portion of the moving member 180, the pressing surface 191 formed at the inner end toward the center of the rotating plate is formed to be inclined downward, the pressing surface 191 according to the inner movement of the moving member 180 is a support plate A support ring plate automatic welding device for construction heavy equipment, characterized in that consisting of; a pressing member 190 for pressing the upper surface of the base material (1,2) placed on the (165).
The method of claim 1,
It is installed on the electric wire 4 which is electrically connected to the torch 10 and provides power to the torch 10 to perform welding, and measures the amount of current flowing through the electric wire 4, and the measured value is measured. It is configured to further include; a current measuring unit 400 for transmitting to the controller 300,
The controller 300 compares the reference value initially set and the measured value measured and transmitted by the current measuring unit 400 to control the torch transfer means 220 to appropriately control the position of the torch 10. Support ring plate automatic welding device for construction heavy equipment, characterized in that.
The method of claim 3, wherein
Hall sensor (hall sensor) is used as the current measuring unit 400, the support ring plate automatic welding device for construction heavy equipment.

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